题目：
To upcycle something is to take a used object and change it to a new function.
Recycling usually breaks down the material that an object is made from 小题1: it is made into something else. By that means it wastes plenty of energy. 小题2: recycling, upcycling just uses something in a new way without reprocessing 小题3: material it's made from. In addition to being 小题4: energy-saving, another major benefit of upcycling is 小题5: it reuses items made of materials which couldn't be dealt with by traditional recycling methods. When something is upcycled, nothing, 小题6: very little, is thrown away, with every component part having a potential use.
An upcycled product is generally 小题7: higher value than the materials or objects which are used to create 小题8: , like metal ring pulls becoming pins or earrings, low-value coins becoming cufflinks(袖扣), and so on.
答案：
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题目分析：木块与车前壁碰撞过程中，木块和车厢组成的系统动量守恒碰撞后，设车厢的速度大小为，取向右为正方向，有----------------（1分）解得，方向向右设经达时间t，木块将与车后壁相碰，由运动学公式得：---...
